Yeah! you can get Starz for free on Apple TV, with simple sign up done on the platform. To begin streaming Starz for free on Apple TV,
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• Launch Apple TV app on any of the devices.
• Go to Store tab.
• Select a channel from Add Channels & Apps or Add Channels option.
• Login with your Apple ID.
• Begin to watch your favorite Starz TV on your device.

Other ways to begin Starz free trial:

With Amazon Prime: Watch Starz TV, simply activate the Starz free trial using Prime Membership.
Free Starz trial with Hulu: Along with Hulu's subscription you get free 7 days Starz trial. Use Hulu credentials to login and watch Starz With DirectTV stream: New subscribers can enjoy Starz for free. It offers Starz free trial for 3 months.
Fubo TV: Sign up for Starz TV using your Fubo TV's subscription.
Using Disney Plus: Sign up for disney bundle plans, it will then offer a trial for Starz.